Question

代码：

vDSP_ctoz(UnsafePointer<DSPComplex>(stream), 2, &output, 1, UInt(bufferSizePOT / 2))

曾经在Swift 2.3中正常工作。现在我收到错误： 'init'不可用：使用'withMemoryRebound（to：capacity：_）临时查看内存...

“stream”是函数的参数：

func FFT(stream : UnsafeMutablePointer<Float>, size: UInt)

我猜错误信息可能会产生误导。有什么想法吗？

Answer 1

似乎您需要一个基本的 UnsafePointer转换。

SE-0107 UnsafeRawPointer API

UnsafePointer转换

...

Unsafe[Mutable]Pointer<Pointee> {
  func withMemoryRebound<T>(to: T.Type, capacity count: Int,
    _ body: (Unsafe[Mutable]Pointer<T>) throws -> ()) rethrows
}

通常，当您要将aPointer类型的UnsafeMutablePointer<T>转换为anotherPointer的{{1}}时，您需要编写如下内容：

UnsafeMutablePointer<U>

在你的情况下，你可以这样写：

（假设aPointer.withMemoryRebound(to: U.self, capacity: capacity) { //<- You need `capacity` counted in `U` anotherPointer in //<-this becomes `UnsafeMutablePointer<U>` //...use `anotherPointer` inside the closure //... //Do NOT take `anotherPointer` out of this closure }为bufferSizePOT。）

Int

Swift 3中的UnsafePointer <dspcomplex>

1 个答案:

UnsafePointer转换